When a program is RUN from BASIC, the following occurs:
- The file is opened with firmware function "CAS IN OPEN",
- The data is read with firmware function "CAS IN DIRECT",
- The file is closed with firmware function "CAS IN CLOSE".
- Then the program is executed using firmare function "MC BOOT PROGAM"
with the execution address taken from the file header.
Therefore, for a file to be RUN it must have a file header.
The disc operating system and roms must be re-enabled